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Fair Value of Derivative and Other Financial Instruments - Commodity Derivatives (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Current assets $ 3,949,000 $ 3,813,000
Deferred charges 747,000 2,622,000
Current liabilities (2,423,000) (1,859,000)
Long-term liabilities (58,000) 0
PNMR and PNM [Member]    
Derivatives, Fair Value [Line Items]    
Amounts recognized for the right to reclaim cash collateral 0 0
Amounts posted as cash collateral under margin arrangements 3,000,000 2,700,000
Obligations to return cash collateral 100,000 100,000
PNMR and PNM [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Current assets 3,949,000 3,813,000
Deferred charges 747,000 2,622,000
Commodity derivative instruments, Assets 4,696,000 6,435,000
Current liabilities (2,423,000) (1,859,000)
Long-term liabilities (58,000) 0
Commodity derivative instruments, Liabilities (2,481,000) (1,859,000)
Net 2,215,000 4,576,000
PNMR and PNM [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Palo Verde Nuclear Generating Station [Member]    
Derivatives, Fair Value [Line Items]    
Current assets 2,700,000 3,000,000
Deferred charges 600,000 2,600,000
Public Service Company of New Mexico [Member]    
Derivatives, Fair Value [Line Items]    
Current assets 3,949,000 3,813,000
Deferred charges 747,000 2,622,000
Current liabilities (2,423,000) (1,859,000)
Long-term liabilities (58,000) 0
Public Service Company of New Mexico [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member]    
Derivatives, Fair Value [Line Items]    
Current assets 100,000 400,000
Deferred charges 100,000  
Current liabilities $ (100,000) $ (200,000)